SY8368AQQC

SY8368A High Efficiency Fast Response 8A Continuous, 16A Peak, 28V Input Synchronous Step Down Regulator General Description Features The SY8368A develops a high efficiency synchronous step-down DC/DC regulator capable of delivering 8A continuous, 16A peak current. The SY8368A operates over a wide input voltage range from 4.0V to 28V and integrates main switch and synchronous switch with very low RDS(ON) to minimize the conduction loss.       The SY8368A adopts the instant PWM architecture to achieve fast transient responses for high step down applications and high efficiency at light loads. In addition, it operates at pseudo-constant frequency of 800kHz under continuous conduction mode to minimize the size of inductor and capacitor.     Ordering Information Applications SY8368 □(□□)□     Temperature Code Package Code Optional Spec Code Ordering Number SY8368AQQC 4.0-28V Wide Input Voltage Range Low RDS(ON) for Internal Switches: 20/10mΩ Instant PWM Architecture to Achieve Fast Transient Response Internal 600μs Soft-start Limits the Inrush Current Pseudo-constant Frequency: 800kHz 8A Continuous, 16A Peak Output Current Capability ±1% 0.6V Reference Voltage Hiccup Mode SCP, OVP Thermal Shutdown with Auto Recovery RoHS Compliant and Halogen Free Package type QFN3x3-12 LCD-TV/Net-TV/3DTV Set Top Box Notebook High Power AP Note -- Typical Applications Efficiency vs. Load Current 95 IN CIN GND PG 85 PG (Open Drain Output) BS CBS L High/Floating/Low ILMT VOUT LX COUT CFF ON/OFF CVCC EN Efficiency (%) VIN 75 65 VIN =7.4V,VOUT =5V VIN =12V,VOUT =5V VIN =19V,VOUT =5V VIN =28V,VOUT =5V 55 R1 FB RFF VCC 45 R2 35 0.001 0.01 0.10 1.00 10.00 Load Current (A) Figure 1 Schematic SY8368A Rev. 0.9C © 2019 Silergy Corp. Figure 2. Efficiency Silergy Corp. Confidential- Prepared for Customer Use Only 1 All Rights Reserved. SY8368A GND EN PG ILMT FB VCC BS Pinout (top view) 12 11 10 9 8 7 1 6 IN 5 IN 4 IN 2 LX GND 3 (QFN3x3-12) Top Mark: AVIxyz, (Device code: AVI, x=year code, y=week code, z= lot number code) Pin Name GND LX Pin Number 1,3 2 IN 4,5,6 BS 7 VCC 8 FB 9 ILMT 10 PG 11 EN 12 SY8368A Rev. 0.9C © 2019 Silergy Corp. Pin Description Ground pin Inductor pin. Connect this pin to the switching node of inductor Input pin. Decouple this pin to the GND pin with at least a 10μF ceramic capacitor. Boot-strap pin. Supply high side gate driver. Decouple this pin to the LX pin with a 0.1μF ceramic capacitor. Internal 3.3V LDO output. Power supply for internal analog circuits and driving circuit. Bypass a capacitor to GND. Output feedback pin. Connect this pin to the center point of the output resistor divider (as shown in Figure 1) to program the output voltage: VOUT=0.6×(1+R1/R2) Current limit setting pin. The current limit is set to 8A, 12A or 16A when this pin is pulled low, floating or pulled high respectively. Power good Indicator. Open drain output when the output voltage is within 90% to 120% of regulation point. Enable control. Pull this pin high to turn on the IC. Do not leave this pin floating. Silergy Corp. Confidential- Prepared for Customer Use Only 2 All Rights Reserved. SY8368A Block Diagram IN Internal Power BS Input UVLO 3.9V LX VCC EN FB 0.6V Internal SST PWM Control & Protect Logic Current Sense Thermal Protection GND PG ILMT Absolute Maximum Ratings (Note 1) IN, LX, PG, EN ----------------------------------------------------------------------------------------------------- -0.3V to 30V BS-LX, FB, ILMT, VCC--------------------------------------------------------------------------------------------- -0.3V to 4V Power Dissipation, PD @ TA = 25°C QFN3x3-12 -----------------------------------------------------------------------3.3W Package Thermal Resistance (Note 2) θ JA -----------------------------------------------------------------------------------------------------------------30°C/W θ JC ---------------------------------------------------------------------------------------------------------------- 4°C/W Junction Temperature Range ------------------------------------------------------------------------------------------------ 150°C Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------------ 260°C Storage Temperature Range -------------------------------------------------------------------------------------- -65°C to 150°C Dynamic LX voltage in 50ns duration --------------------------------------------------------------------- IN+3V to GND-4V Recommended Operating Conditions (Note 3) Supply Input Voltage ---------------------------------------------------------------------------------------------------- 4V to 28V Junction Temperature Range ------------------------------------------------------------------------------------- -40°C to 125°C Ambient Temperature Range -------------------------------------------------------------------------------------- -40°C to 85°C SY8368A Rev. 0.9C © 2019 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 3 All Rights Reserved. SY8368A Electrical Characteristics (VIN = 12V, VOUT =5V, COUT = 100uF, TA = 25°C, IOUT = 2A unless otherwise specified) Parameter Input Voltage Range Quiescent Current Symbol VIN IQ Shutdown Current Feedback Reference Voltage FB Input Current Top FET RON Bottom FET RON Discharge FET RON Bottom FET Current Limit ISHDN VREF IFB RDS(ON)1 RDS(ON)2 RDIS ILIM Test Conditions Min 4.0 IOUT=0, VFB=VREF×105% EN=0 Max 28 100 0.594 VFB=4V Typ µA 3 10 µA 0.6 0.606 V 50 nA mΩ mΩ Ω -50 20 10 50 ILMT=’0’ ILMT=Floating ILMT=’1’ Unit V 8 12 16 Vcc-0.8 A ILMT Rising Threshold VILMTH VCC V ILMT Falling Threshold VILMTL 0.8 V Soft Start Time tSS 600 µs EN Rising Threshold VENH 0.8 V EN Falling Threshold VENL 0.4 V Input UVLO Threshold 3.9 V VUVLO UVLO hysteresis VHYS 0.3 V Oscillator Frequency FOSC Vo=5V 0.68 0.8 0.92 MHz Min ON Time tON,MIN VIN=VINMAX 50 ns Min OFF Time tOFF,MIN 180 ns VCC Output VCC VIN=4.2V 3.2 3.3 3.4 V Output Over Voltage VFB rising 115 120 125 %VREF Threshold Output Over Voltage 2 %VREF Hysteresis Output Over Voltage 20 µs Delay Time Power Good Threshold VFB rising (Good) 88 90 92 %VREF Power Good Hysteresis 2 %VREF Power Good Delay Time 10 µs Thermal Shutdown TSD 150 °C Temperature Thermal Shutdown THYS 15 °C hysteresis Note 1: Stresses beyond the “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability Note 2: θ JA is measured in the natural convection at TA = 25°C on a four-layer Silergy Evaluation Board. Note 3: The device is not guaranteed to function outside its operating conditions. SY8368A Rev. 0.9C © 2019 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 4 All Rights Reserved. SY8368A QFN3×3-12 Package Outline Drawing Top View Side View Bottom View SY8368A Rev. 0.9C © 2019 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 5 All Rights Reserved. SY8368A Recommended PCB layout (Reference Only) Notes: All dimension in MM and exclude mold flash & metal burr. SY8368A Rev. 0.9C © 2019 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 6 All Rights Reserved. SY8368A Taping & Reel Specification 1. Taping orientation QFN3x3 Feeding direction 2. Carrier Tape & Reel specification for packages Reel Size Package types Tape width (mm) Pocket pitch(mm) Reel size (Inch) Trailer length(mm) Leader length (mm) Qty per reel 12 8 13" 400 400 5000 QFN3x3 3. Others: NA SY8368A Rev. 0.9C © 2019 Silergy Corp. Powered by TCPDF (www.tcpdf.org) Silergy Corp. Confidential- Prepared for Customer Use Only 7 All Rights Reserved.